Search for Majorana neutrinos in same-sign W W scattering events from pp collisions at √s = 13 TeV

ATLAS Publications; J.F. Allen; T.M. Carter; D. Duda; J.M. Gargan; R.Y. Gonzalez Andana; A. Hasib; V.A. Parrish; E.A. Pender; T. Qiu; E.P. Takeva; N. Themistokleous; E.M. Villhauer; Z. Xu; E. Zaid

doi:10.1140/epjc/s10052-023-11915-y

Search for Majorana neutrinos in same-sign W W scattering events from pp collisions at √s = 13 TeV

ATLAS Publications, J.F. Allen, T.M. Carter, D. Duda, J.M. Gargan, R.Y. Gonzalez Andana, A. Hasib, V.A. Parrish, E.A. Pender, T. Qiu, E.P. Takeva, N. Themistokleous, E.M. Villhauer, Z. Xu, E. Zaid

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

A search for Majorana neutrinos in same-sign W W scattering events is presented. The analysis uses √s = 13 TeV proton–proton collision data with an integrated luminosity of 140 fb−1 recorded during 2015–2018 by the ATLAS
detector at the Large Hadron Collider. The analysis targets final states including exactly two same-sign muons and at least two hadronic jets well separated in rapidity. The modelling of the main backgrounds, from Standard Model same-
sign W W scattering and W Z production, is constrained with data in dedicated signal-depleted control regions. The distribution of the transverse momentum of the second-hardest muon is used to search for signals originating from a heavy
Majorana neutrino with a mass between 50 GeV and 20 TeV. No significant excess is observed over the background expectation. The results are interpreted in a benchmark scenario of the Phenomenological Type-I Seesaw model. In addition, the sensitivity to the Weinberg operator is investigated. Upper
limits at the 95% confidence level are placed on the squared muon-neutrino–heavy-neutrino mass-mixing matrix element |VμN |2 as a function of the heavy Majorana neutrino’s mass m N , and on the effective μμ Majorana neutrino mass |mμμ|.

Original language	English
Article number	824
Pages (from-to)	1-26
Number of pages	26
Journal	The European Physical Journal C
Volume	83
Issue number	9
DOIs	https://doi.org/10.1140/epjc/s10052-023-11915-y
Publication status	Published - 15 Sept 2023

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10.1140/epjc/s10052-023-11915-yLicence: Creative Commons: Attribution (CC-BY)

http://arxiv.org/abs/2305.14931

3 Finished
3 Active

Upgrade of the ATLAS detector at the LHC (2023-26)
Clark, P.
1/04/23 → 31/03/26
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C.
1/04/23 → 30/09/25
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C.
1/10/22 → 30/09/25
Project: Research

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ATLAS Publications, Allen, J. F., Carter, T. M., Duda, D., Gargan, J. M., Gonzalez Andana, R. Y., Hasib, A., Parrish, V. A., Pender, E. A., Qiu, T., Takeva, E. P., Themistokleous, N., Villhauer, E. M., Xu, Z., & Zaid, E. (2023). Search for Majorana neutrinos in same-sign W W scattering events from pp collisions at √s = 13 TeV. The European Physical Journal C, 83(9), 1-26. Article 824. https://doi.org/10.1140/epjc/s10052-023-11915-y

@article{4255e92844a5439297593f9fb556cd9d,

title = "Search for Majorana neutrinos in same-sign W W scattering events from pp collisions at √s = 13 TeV",

abstract = "A search for Majorana neutrinos in same-sign W W scattering events is presented. The analysis uses √s = 13 TeV proton–proton collision data with an integrated luminosity of 140 fb−1 recorded during 2015–2018 by the ATLASdetector at the Large Hadron Collider. The analysis targets final states including exactly two same-sign muons and at least two hadronic jets well separated in rapidity. The modelling of the main backgrounds, from Standard Model same-sign W W scattering and W Z production, is constrained with data in dedicated signal-depleted control regions. The distribution of the transverse momentum of the second-hardest muon is used to search for signals originating from a heavyMajorana neutrino with a mass between 50 GeV and 20 TeV. No significant excess is observed over the background expectation. The results are interpreted in a benchmark scenario of the Phenomenological Type-I Seesaw model. In addition, the sensitivity to the Weinberg operator is investigated. Upperlimits at the 95% confidence level are placed on the squared muon-neutrino–heavy-neutrino mass-mixing matrix element |VμN |2 as a function of the heavy Majorana neutrino{\textquoteright}s mass m N , and on the effective μμ Majorana neutrino mass |mμμ|.",

author = "{ATLAS Publications} and Clark, {Philip James} and Sinead Farrington and Yanyan Gao and Christos Leonidopoulos and Martin, {Victoria Jane} and Liza Mijovic and Benjamin Wynne and Sara Alderweireldt and J.F. Allen and T.M. Carter and D. Duda and J.M. Gargan and {Gonzalez Andana}, R.Y. and A. Hasib and V.A. Parrish and E.A. Pender and T. Qiu and E.P. Takeva and N. Themistokleous and E.M. Villhauer and Z. Xu and E. Zaid",

year = "2023",

month = sep,

day = "15",

doi = "10.1140/epjc/s10052-023-11915-y",

language = "English",

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ATLAS Publications, Allen, JF, Carter, TM, Duda, D, Gargan, JM, Gonzalez Andana, RY, Hasib, A, Parrish, VA, Pender, EA, Qiu, T, Takeva, EP, Themistokleous, N, Villhauer, EM, Xu, Z & Zaid, E 2023, 'Search for Majorana neutrinos in same-sign W W scattering events from pp collisions at √s = 13 TeV', The European Physical Journal C, vol. 83, no. 9, 824, pp. 1-26. https://doi.org/10.1140/epjc/s10052-023-11915-y

TY - JOUR

T1 - Search for Majorana neutrinos in same-sign W W scattering events from pp collisions at √s = 13 TeV

AU - ATLAS Publications

AU - Clark, Philip James

AU - Farrington, Sinead

AU - Gao, Yanyan

AU - Leonidopoulos, Christos

AU - Martin, Victoria Jane

AU - Mijovic, Liza

AU - Wynne, Benjamin

AU - Alderweireldt, Sara

AU - Allen, J.F.

AU - Carter, T.M.

AU - Duda, D.

AU - Gargan, J.M.

AU - Gonzalez Andana, R.Y.

AU - Hasib, A.

AU - Parrish, V.A.

AU - Pender, E.A.

AU - Qiu, T.

AU - Takeva, E.P.

AU - Themistokleous, N.

AU - Villhauer, E.M.

AU - Xu, Z.

AU - Zaid, E.

PY - 2023/9/15

Y1 - 2023/9/15

N2 - A search for Majorana neutrinos in same-sign W W scattering events is presented. The analysis uses √s = 13 TeV proton–proton collision data with an integrated luminosity of 140 fb−1 recorded during 2015–2018 by the ATLASdetector at the Large Hadron Collider. The analysis targets final states including exactly two same-sign muons and at least two hadronic jets well separated in rapidity. The modelling of the main backgrounds, from Standard Model same-sign W W scattering and W Z production, is constrained with data in dedicated signal-depleted control regions. The distribution of the transverse momentum of the second-hardest muon is used to search for signals originating from a heavyMajorana neutrino with a mass between 50 GeV and 20 TeV. No significant excess is observed over the background expectation. The results are interpreted in a benchmark scenario of the Phenomenological Type-I Seesaw model. In addition, the sensitivity to the Weinberg operator is investigated. Upperlimits at the 95% confidence level are placed on the squared muon-neutrino–heavy-neutrino mass-mixing matrix element |VμN |2 as a function of the heavy Majorana neutrino’s mass m N , and on the effective μμ Majorana neutrino mass |mμμ|.

AB - A search for Majorana neutrinos in same-sign W W scattering events is presented. The analysis uses √s = 13 TeV proton–proton collision data with an integrated luminosity of 140 fb−1 recorded during 2015–2018 by the ATLASdetector at the Large Hadron Collider. The analysis targets final states including exactly two same-sign muons and at least two hadronic jets well separated in rapidity. The modelling of the main backgrounds, from Standard Model same-sign W W scattering and W Z production, is constrained with data in dedicated signal-depleted control regions. The distribution of the transverse momentum of the second-hardest muon is used to search for signals originating from a heavyMajorana neutrino with a mass between 50 GeV and 20 TeV. No significant excess is observed over the background expectation. The results are interpreted in a benchmark scenario of the Phenomenological Type-I Seesaw model. In addition, the sensitivity to the Weinberg operator is investigated. Upperlimits at the 95% confidence level are placed on the squared muon-neutrino–heavy-neutrino mass-mixing matrix element |VμN |2 as a function of the heavy Majorana neutrino’s mass m N , and on the effective μμ Majorana neutrino mass |mμμ|.

U2 - 10.1140/epjc/s10052-023-11915-y

DO - 10.1140/epjc/s10052-023-11915-y

M3 - Article

SN - 1434-6052

VL - 83

SP - 1

EP - 26

JO - The European Physical Journal C

JF - The European Physical Journal C

IS - 9

M1 - 824

ER -

Search for Majorana neutrinos in same-sign W W scattering events from pp collisions at √s = 13 TeV

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Upgrade of the ATLAS detector at the LHC (2023-26)

Experimental Particle Physics at the University of Edinburgh

Experimental Particle Physics at the University of Edinburgh

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